@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix : <http://www.w3.org/2002/07/owl#> .
@prefix oboInOwl: <http://www.geneontology.org/formats/oboInOwl#> .
@prefix resource: <http://semanticscience.org/resource/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix obo: <http://purl.obolibrary.org/obo/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .

obo:IAO_0000136
    a :ObjectProperty ;
    rdfs:label "is about", "is about"@en .

dc:description
    a :AnnotationProperty .

resource:CHEMINF_000025
    a :Class ;
    rdfs:label "physical descriptor" .

resource:CHEMINF_000266
    a :Class ;
    rdfs:label "chemical substance" .

resource:CHEMINF_000442
    dc:description "A physical descriptor which gives a measure of the acidity or basicity of an aqueous solution, defined as the decimal logarithm of the reciprocal of the hydrogen ion activity in a solution. " ;
    a :Class ;
    rdfs:label "pH descriptor"@en ;
    rdfs:subClassOf resource:CHEMINF_000025, [
        a :Restriction ;
        :onProperty obo:IAO_0000136 ;
        :someValuesFrom resource:CHEMINF_000266
    ] .